<?php

class Database 
{ 
    // Store the single instance of Database 
    private static $m_pInstance; 
	const dbHost = Settings::DB_HOST;
	
	private $carrierInfo = array();

    private function __construct() {} 

    public static function getInstance() 
    { 
        if (!self::$m_pInstance) 
        { 
            self::$m_pInstance = new Database(); 
        } 

        return self::$m_pInstance; 
    } 
	
	public function getCarrierInfo(){
	
	}
	
	public function getCity($iata){
	
	}
}  

?>